136 lines
3.6 KiB
C++
136 lines
3.6 KiB
C++
#include <flowlayout.h>
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#include <QWidget>
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FlowLayout::FlowLayout(QWidget *parent, int margin, int hSpacing, int vSpacing) :
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QLayout(parent),
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horzSpace(hSpacing),
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vertSpace(vSpacing)
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{
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setContentsMargins(margin, margin, margin, margin);
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}
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FlowLayout::FlowLayout(int margin, int hSpacing, int vSpacing) :
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horzSpace(hSpacing),
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vertSpace(vSpacing)
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{
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setContentsMargins(margin, margin, margin, margin);
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}
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FlowLayout::~FlowLayout()
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{
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QLayoutItem *item;
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while ((item = takeAt(0)))
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delete item;
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}
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void FlowLayout::addItem(QLayoutItem *item) {
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itemList.append(item);
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}
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int FlowLayout::horizontalSpacing() const {
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if (horzSpace >= 0)
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return horzSpace;
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else
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return smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
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}
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int FlowLayout::verticalSpacing() const {
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if (vertSpace >= 0)
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return vertSpace;
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else
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return smartSpacing(QStyle::PM_LayoutVerticalSpacing);
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}
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int FlowLayout::count() const {
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return itemList.size();
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}
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QLayoutItem *FlowLayout::itemAt(int index) const {
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return itemList.value(index);
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}
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QLayoutItem *FlowLayout::takeAt(int index) {
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if (index >= 0 && index < itemList.size())
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return itemList.takeAt(index);
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return nullptr;
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}
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Qt::Orientations FlowLayout::expandingDirections() const {
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return { };
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}
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bool FlowLayout::hasHeightForWidth() const {
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return true;
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}
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int FlowLayout::heightForWidth(int width) const {
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int height = doLayout(QRect(0, 0, width, 0), true);
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return height;
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}
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void FlowLayout::setGeometry(const QRect &rect) {
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QLayout::setGeometry(rect);
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doLayout(rect, false);
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}
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QSize FlowLayout::sizeHint() const {
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return minimumSize();
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}
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QSize FlowLayout::minimumSize() const {
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QSize size;
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for (const QLayoutItem *item : qAsConst(itemList))
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size = size.expandedTo(item->minimumSize());
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const QMargins margins = contentsMargins();
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size += QSize(margins.left() + margins.right(), margins.top() + margins.bottom());
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return size;
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}
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int FlowLayout::doLayout(const QRect &rect, bool testOnly) const {
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int left, top, right, bottom;
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getContentsMargins(&left, &top, &right, &bottom);
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QRect effectiveRect = rect.adjusted(+left, +top, -right, -bottom);
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int x = effectiveRect.x();
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int y = effectiveRect.y();
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int lineHeight = 0;
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for (QLayoutItem *item : qAsConst(itemList)) {
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const QWidget *wid = item->widget();
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int spaceX = horizontalSpacing();
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if (spaceX == -1)
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spaceX = wid->style()->layoutSpacing(QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Horizontal);
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int spaceY = verticalSpacing();
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if (spaceY == -1)
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spaceY = wid->style()->layoutSpacing(QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Vertical);
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int nextX = x + item->sizeHint().width() + spaceX;
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if (nextX - spaceX > effectiveRect.right() && lineHeight > 0) {
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x = effectiveRect.x();
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y = y + lineHeight + spaceY;
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nextX = x + item->sizeHint().width() + spaceX;
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lineHeight = 0;
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}
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if (!testOnly)
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item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));
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x = nextX;
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lineHeight = qMax(lineHeight, item->sizeHint().height());
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}
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return y + lineHeight - rect.y() + bottom;
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}
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int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const {
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QObject *parent = this->parent();
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if (!parent) {
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return -1;
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} else if (parent->isWidgetType()) {
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QWidget *pw = static_cast<QWidget *>(parent);
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return pw->style()->pixelMetric(pm, nullptr, pw);
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} else {
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return static_cast<QLayout *>(parent)->spacing();
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}
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}
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